Quote Originally Posted by rubah
actually though, I'm not sure that you CAN miss any sidequests in ffx. If you're playing the PAL version, there might be some stuff you'd want to know in advance (like. . .where teh dark aeons are?)
The only things I think you can actually miss permanantly are a few of the Al Bhed Primers (on the recovery ship, in Bevelle temple before the Trials, and in Home). There are a few other items in those locations you can miss, but you can get them by other means later.